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Elastic Docs ›Elasticsearch Guide [8.4] ›REST APIs ›Transform APIs

Get transform statistics API

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Get transform statistics API

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Retrieves usage information for transforms.

Request

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GET _transform/<transform_id>/_stats

GET _transform/<transform_id>,<transform_id>/_stats

GET _transform/_stats

GET _transform/_all/_stats

GET _transform/*/_stats

Prerequisites

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Requires the following privileges:

  • cluster: monitor_transform (the transform_user built-in role grants this privilege)
  • destination index: read, view_index_metadata.

Description

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You can get statistics for multiple transforms in a single API request by using a comma-separated list of identifiers or a wildcard expression. You can get statistics for all transforms by using _all, by specifying * as the <transform_id>, or by omitting the <transform_id>.

Path parameters

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<transform_id>
(Optional, string) Identifier for the transform. It can be a transform identifier or a wildcard expression. If you do not specify one of these options, the API returns information for all transforms.

Query parameters

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allow_no_match

(Optional, Boolean) Specifies what to do when the request:

  • Contains wildcard expressions and there are no transforms that match.
  • Contains the _all string or no identifiers and there are no matches.
  • Contains wildcard expressions and there are only partial matches.

The default value is true, which returns an empty transforms array when there are no matches and the subset of results when there are partial matches.

If this parameter is false, the request returns a 404 status code when there are no matches or only partial matches.

from
(Optional, integer) Skips the specified number of transforms. The default value is 0.
size
(Optional, integer) Specifies the maximum number of transforms to obtain. The default value is 100.

Response body

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The API returns an array of statistics objects for transforms, which are sorted by the id value in ascending order. All of these properties are informational; you cannot update their values.

checkpointing

(object) Contains statistics about checkpoints.

Properties of checkpointing
changes_last_detected_at
(date) The timestamp when changes were last detected in the source indices.
last

(object) Contains statistics about the last completed checkpoint.

Properties of last
checkpoint
(integer) The sequence number for the checkpoint.
time_upper_bound_millis
(date) When using time-based synchronization, this timestamp indicates the upper bound of data that is included in the checkpoint.
timestamp_millis
(date) The timestamp of the checkpoint, which indicates when the checkpoint was created.
last_search_time
(date) The timestamp of the last search in the source indices. This field is only shown if the transform is running.
next

(object) Contains statistics about the next checkpoint that is currently in progress. This object appears only when the transform state is indexing.

Properties of next
checkpoint
(integer) The sequence number for the checkpoint.
checkpoint_progress
(object) Contains statistics about the progress of the checkpoint. For example, it lists the total_docs, docs_remaining, percent_complete, docs_processed, and docs_indexed. This information is available only for batch transforms and the first checkpoint of continuous transforms.
time_upper_bound_millis
(date) When using time-based synchronization, this timestamp indicates the upper bound of data that is included in the checkpoint.
timestamp_millis
(date) The timestamp of the checkpoint, which indicates when the checkpoint was created.
operations_behind
(integer) The number of operations that have occurred on the source index but have not been applied to the destination index yet. A high number can indicate that the transform is failing to keep up.
id
(string) Identifier for the transform.
node

(object) For started transforms only, the node upon which the transform is started.

Properties of node
attributes
(object) A list of attributes for the node.
ephemeral_id
(string) The node ephemeral ID.
id
(string) The unique identifier of the node. For example, "0-o0tOoRTwKFZifatTWKNw".
name
(string) The node name. For example, 0-o0tOo.
transport_address
(string) The host and port where transport HTTP connections are accepted. For example, 127.0.0.1:9300.
reason
(string) If a transform has a failed state, this property provides details about the reason for the failure.
state

(string) The status of the transform, which can be one of the following values:

  • aborting: The transform is aborting.
  • failed: The transform failed. For more information about the failure, check the reason field.
  • indexing: The transform is actively processing data and creating new documents.
  • started: The transform is running but not actively indexing data.
  • stopped: The transform is stopped.
  • stopping: The transform is stopping.
stats

(object) An object that provides statistical information about the transform.

Properties of stats
delete_time_in_ms
(long) The amount of time spent deleting, in milliseconds.
documents_deleted
(long) The number of documents that have been deleted from the destination index due to the retention policy for this transform.
documents_indexed
(long) The number of documents that have been indexed into the destination index for the transform.
documents_processed
(long) The number of documents that have been processed from the source index of the transform.
exponential_avg_checkpoint_duration_ms
(double) Exponential moving average of the duration of the checkpoint, in milliseconds.
exponential_avg_documents_indexed
(double) Exponential moving average of the number of new documents that have been indexed.
exponential_avg_documents_processed
(double) Exponential moving average of the number of documents that have been processed.
index_failures
(long) The number of indexing failures.
index_time_in_ms
(long) The amount of time spent indexing, in milliseconds.
index_total
(long) The number of index operations.
pages_processed
(long) The number of search or bulk index operations processed. Documents are processed in batches instead of individually.
processing_time_in_ms
(long) The amount of time spent processing results, in milliseconds.
processing_total
(long) The number of processing operations.
search_failures
(long) The number of search failures.
search_time_in_ms
(long) The amount of time spent searching, in milliseconds.
search_total
(long) The number of search operations on the source index for the transform.
trigger_count
(long) The number of times the transform has been triggered by the scheduler. For example, the scheduler triggers the transform indexer to check for updates or ingest new data at an interval specified in the frequency property.

Response codes

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404 (Missing resources)
If allow_no_match is false, this code indicates that there are no resources that match the request or only partial matches for the request.

Examples

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The following example skips for the first five transforms and gets usage information for a maximum of ten results:

GET _transform/_stats?from=5&size=10

The following example gets usage information for the transform:

GET _transform/ecommerce-customer-transform/_stats

The API returns the following results:

{
  "count" : 1,
  "transforms" : [
    {
      "id" : "ecommerce-customer-transform",
      "state" : "started",
      "node" : {
        "id" : "cpTIGMsVQ8Gqwqlxxxxxxx",
        "name" : "my.home",
        "ephemeral_id" : "5-L21nFsQxxxxxxxxxx-xx",
        "transport_address" : "127.0.0.1:9300",
        "attributes" : { }
      },
      "stats" : {
        "pages_processed" : 78,
        "documents_processed" : 6027,
        "documents_indexed" : 68,
        "documents_deleted": 22,
        "delete_time_in_ms": 214,
        "trigger_count" : 168,
        "index_time_in_ms" : 412,
        "index_total" : 20,
        "index_failures" : 0,
        "search_time_in_ms" : 353,
        "search_total" : 78,
        "search_failures" : 0,
        "processing_time_in_ms" : 8,
        "processing_total" : 78,
        "exponential_avg_checkpoint_duration_ms" : 97.30637923893185,
        "exponential_avg_documents_indexed" : 2.2064915040974062,
        "exponential_avg_documents_processed" : 179.89419945785045
      },
      "checkpointing" : {
        "last" : {
          "checkpoint" : 20,
          "timestamp_millis" : 1585344558220,
          "time_upper_bound_millis" : 1585344498220
        },
        "changes_last_detected_at" : 1585344558219
      }
    }
  ]
}
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